Mechanical Engineering Exam > Mechanical Engineering Questions > Assertion (A): For pressure ratio greater tha...
Start Learning for Free
Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.
Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.
Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Assertion (A): For pressure ratio greater than the critical pressure r...
Ans. (c) A is correct but R is wrong.
Most Upvoted Answer
Assertion (A): For pressure ratio greater than the critical pressure r...
Assertion (A): Overview
The assertion states that for a pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required. This is true because:
- Critical Pressure Ratio: The critical pressure ratio is the threshold at which the flow becomes choked. Beyond this point, a convergent-divergent nozzle is needed to achieve supersonic speeds.
- Flow Conditions: In a convergent nozzle, the flow reaches Mach 1 at the throat, while in a divergent section, it can expand to supersonic speeds.
Reason (R): Analysis
The reason states that the divergent portion of the nozzle increases the flow area, which increases the mass flow rate. However, this statement is misleading:
- Mass Flow Rate: While it is true that a divergent section allows for increased flow area, the mass flow rate is not solely about the area. It also depends on the pressure and temperature conditions of the flow.
- Choked Flow: When the flow is choked, the mass flow rate is determined primarily by the throat area and upstream conditions, not merely by the divergent section.
Conclusion on Options
- Option C: A is true (a convergent-divergent nozzle is required for a pressure ratio greater than critical), but R is false (the reason does not accurately explain why a divergent section is needed).
- The correct interpretation is that while the divergent section facilitates supersonic flow, it does not directly increase mass flow rate in the manner described.
Thus, the correct answer is option 'C'.
The assertion states that for a pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required. This is true because:
- Critical Pressure Ratio: The critical pressure ratio is the threshold at which the flow becomes choked. Beyond this point, a convergent-divergent nozzle is needed to achieve supersonic speeds.
- Flow Conditions: In a convergent nozzle, the flow reaches Mach 1 at the throat, while in a divergent section, it can expand to supersonic speeds.
Reason (R): Analysis
The reason states that the divergent portion of the nozzle increases the flow area, which increases the mass flow rate. However, this statement is misleading:
- Mass Flow Rate: While it is true that a divergent section allows for increased flow area, the mass flow rate is not solely about the area. It also depends on the pressure and temperature conditions of the flow.
- Choked Flow: When the flow is choked, the mass flow rate is determined primarily by the throat area and upstream conditions, not merely by the divergent section.
Conclusion on Options
- Option C: A is true (a convergent-divergent nozzle is required for a pressure ratio greater than critical), but R is false (the reason does not accurately explain why a divergent section is needed).
- The correct interpretation is that while the divergent section facilitates supersonic flow, it does not directly increase mass flow rate in the manner described.
Thus, the correct answer is option 'C'.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
|
Explore Courses for Mechanical Engineering exam
|
|
Similar Mechanical Engineering Doubts
Top Courses for Mechanical EngineeringView all
Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?
Question Description
Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup